Protein Family Models

Region 4 of sigma-70 like sigma-factors are involved in binding to the -35 promoter element via a helix-turn-helix motif [1]. [1]. 11931761. Structure of the bacterial RNA polymerase promoter specificity sigma subunit. Campbell EA, Muzzin O, Chlenov M, Sun JL, Olson CA, Weinman O, Trester-Zedlitz ML, Darst SA;. Mol Cell 2002;9:527-539. (from Pfam)

Date:

2024-10-16

This HMM hits a core region shared by multiple sigma factors, interchangeable subunits that complete the RNA polymerase holoenzyme and allow transcription to start. In E. coli K-12 alone, this HMM hits RpoD (sigma-70), RpoH (sigma-32), FliA (sigma-28), FecI (sigma-19), RpoS, and RpoE.

Date:

2024-10-16

sigma-70 family RNA polymerase sigma factor is an initiation factor that promotes the attachment of RNA polymerase to specific initiation sites and is then released; similar to Mycobacterium tuberculosis extracytoplasmic function (ECF) RNA polymerase sigma factor SigJ

Date:

2019-06-07

This model encompasses all varieties of the sigma-70 type sigma factors including the ECF subfamily. A number of sigma factors have names with a different number than 70 (i.e. sigma-38), but in fact, all except for the Sigma-54 family (TIGR02395) are included within this family. Several PFAM models hit segments of these sequences including Sigma-70 region 2 (PF04542) and Sigma-70, region 4 (PF04545), but not always above their respective trusted cutoffs.

Date:

2024-06-27

This group of sigma factors are members of the sigma-70 family (TIGR02937). They and appear by homology, tree building and bidirectional best hits, to represent a conserved family. This family is found in a limited number of bacterial lineages. This family includes apparent paralogous expansion in Streptomyces coelicolor A3(2), and multiple copies in Mycobacterium smegmatis MC2, Streptomyces avermitilis MA-4680 and Nocardia farcinica IFM10152.

Date:

2021-07-30

Sigma factor binds with the catalytic core of RNA polymerase to produce the holoenzyme and directs bacterial core RNA polymerase to specific promoter elements to initiate transcription

Gene:

sigJ

Date:

2021-08-05